The way to recover a from database corruption, is to restore from a 'good' backup. If your database is corrupt and you backup said corrupt database there is no point in trying to restore from that backup. You still have a corrupt database. Which is way the poster suggested running checkdb before the backup so you know, at least have a good idea, that there is no corruption in the backup.

There are other ways to fix corrupt databases, but that's a little out of scope of this article. If you want to learn more about corrupt databases checkout Paul Randal's blog here http://www.sqlskills.com/BLOGS/PAUL/category/Corruption.aspx Paul used to manage the Storage Engine Team for SQL Server 2005 and 2008 (I believe) and he is the person who wrote DBCC CHECKDB